Current electricity questions | form six Physics

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#	Question
1	An LCR circuit with R=70Ω in series with a parallel combination of L=1.5H and C=30μF is driven by a 230V supply with angular frequency of 300rad/s. (i) Find the power in put to the circuit. (ii) At the frequency $omega_{0}= frac{l}{sqrt{LC}}$ , how does the circuit respond?. Mathematical Calculation
2	Define the following terms: (i) Current density (ii) Conductivity. Short answers
3	Under what condition is Ohm’s law true? Short answers
4	Why does the voltage across the terminals of a cell or battery fall when it is delivering a current? Short answers
5	Define temperature coefficient of resistance. Short answers
6	A heating coil of Nichrome wire with cross sectional area of 0.1mm² operate on a 12V supply, and has a power of 36W when immersed in water at 373K. Calculate the length of the wire. Mathematical Calculation
7	What is meant by “power rating “ as regards to a resistor?. Short answers
8	Mention two distinct velocities of an electron in a wire. Short answers
9	A 20k $Omega$ resistor is to be connected across a potential difference of 300V. Calculate the required power rating. Mathematical Calculation
10	Explain the following observation: Light in the bulb come on once the switch is kept on depite the drift velocity of electrons being very low. The potentiometer is said to be a better device for measuring the potential difference (p.d) than a moving coil voltmeter. Short answers

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